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Sequoia <br />� Analytical <br />404 N W Set lane <br />Walnut Creek CA 94598 <br />(925) 988-9600 <br />FAX (925) 988-9673 <br />WWW sequoialabs corn <br />ler Ryan, [nf- - Dublin Project Chevron <br />6747 Sierra Court Suite j Project Number Chevron SS49-5775 Reported <br />Dublin CA 94568 Project Manager Scott Polston 25 -Apr -00 17 37 <br />Total Purgeable Hydrocarbons (C6-Ci2) and BTEX in Air by DHS LUFT - Quality Control <br />Sequoia Analytical - Walnut Creek <br />Reporting Spike Source %REC RPD <br />'knalyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch OD21004 - EPA 5030E [PITS <br />Blank (OD21004-BLK1) Prepared & Analyzed 21 -Apr -00 <br />Purgeable Hydrocarbons ND 2 0 mgim' Air <br />Benzene <br />ND <br />0 010 <br />600 877 70.130 <br />Toluene <br />ND <br />0 010 <br />Ethylbenzene <br />ND <br />0 010 <br />164 <br />Xylenes (total) <br />ND <br />0 010 " <br />Toluene <br />Surrogate a.raa-Tniluorofoluene <br />606 <br />200 880 70.130 828 <br />600 101 -0-130 <br />LCS (OD21004-BSI) <br />210 <br />0 010 <br />Prepared 21 -Apr -0O Analyzed 24 -Apr -00 <br />Benzene <br />150 <br />0 010 mg/ml Air <br />200 75 0 70-130 <br />Toluene <br />162 <br />0 010 <br />2 00 810 70-130 <br />Ethylbenzene <br />157 <br />0 010 <br />200 785 70-130 <br />Xylenes (total) <br />5 12 <br />0 010 <br />600 85 3 70-130 <br />tAaa-TrJluorotoluene <br />494 <br />600 823 70-130 <br />ff(,0D,21004-BS2) <br />Prepared & Analyzed 24 -Apr -00 <br />Benzene <br />328 <br />0 010 mg/ml Air <br />400 82 0 70-130 <br />Toluene <br />346 <br />0 010 <br />400 865 70-130 <br />Ethylbenzene <br />3 58 <br />0 010 <br />400 895 70-130 <br />Xylenes (total) <br />113 <br />0 010 <br />12 0 942 70.130 <br />Surrogate aaa-TiF luonololuene <br />526 <br />600 877 70.130 <br />LCS Dup (OD21004-BSDI) <br />Prepared 21 -Apr -0O Analyzed 24 -Apr -00 <br />Q-07 <br />Bemzaiie <br />164 <br />0 010 <br />mg/ml Air 200 82.0 70-130 892 <br />20 <br />Toluene <br />176 <br />0 010 <br />200 880 70.130 828 <br />20 <br />Ethylbenzene <br />210 <br />0 010 <br />200 105 70.130 289 <br />20 <br />Xylenes (total) <br />5 56 <br />0 010 <br />600 927 70-130 824 <br />20 <br />Surrogate aaa-Trfluorotoluene <br />522 <br />600 870 70.130 <br />Sequoia Analytical - Walnut Creek The results to this report apply to the samples analyzed in accordance with the chmn of <br />cusfody documeru This analytical report must be reproduced in its entirety <br />0 <br />Page 7 of 10 <br />- <br />